Yes, crane flies. Never heard that term before, though. I dunno, maybe "leatherjacket" is just a local name, but that's what everyone here calls those fuckers.
Well then, excuse me while I vomit! Haha, jk, but seriously, that's disgusting. I mean, I would keep smoking if I were you too, but to smoke ANY insect is messed up. Maybe you should have cleaned the bong with your dealer's son lol.
If it had been smoked, like, minutes ago, I definately would have cleaned it, but not only was it the previous night which the poor critter was immolated but, knowing "John," he had likely put at least a 1/4 through it since then. The taste remained, but nothing else.